libavformat/pmpdec.c

   1 /*
   2  * PMP demuxer
   3  * Copyright (c) 2011 Reimar Döffinger
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/intreadwrite.h"
  23 #include "avformat.h"
  24
  25 typedef struct PMPContext {
  26     int       cur_stream;
  27     int       num_streams;
  28     int       audio_packets;
  29     int       current_packet;
  30     uint32_t *packet_sizes;
  31     int       packet_sizes_alloc;
  32 } PMPContext;
  33
  34 static int pmp_probe(AVProbeData *p)
  35 {
  36     if (!memcmp(p->buf, "pmpm\1\0\0\0", 8))
  37         return AVPROBE_SCORE_MAX;
  38     return 0;
  39 }
  40
  41 static int pmp_header(AVFormatContext *s, AVFormatParameters *ap)
  42 {
  43     PMPContext *pmp = s->priv_data;
  44     AVIOContext *pb = s->pb;
  45     int tb_num, tb_den;
  46     int index_cnt;
  47     int audio_codec_id = CODEC_ID_NONE;
  48     int srate, channels;
  49     int i;
  50     uint64_t pos;
  51     AVStream *vst = avformat_new_stream(s, NULL);
  52     if (!vst)
  53         return AVERROR(ENOMEM);
  54     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  55     avio_skip(pb, 8);
  56     switch (avio_rl32(pb)) {
  57     case 0:
  58         vst->codec->codec_id = CODEC_ID_MPEG4;
  59         break;
  60     case 1:
  61         vst->codec->codec_id = CODEC_ID_H264;
  62         break;
  63     default:
  64         av_log(s, AV_LOG_ERROR, "Unsupported video format\n");
  65         break;
  66     }
  67     index_cnt          = avio_rl32(pb);
  68     vst->codec->width  = avio_rl32(pb);
  69     vst->codec->height = avio_rl32(pb);
  70
  71     tb_num = avio_rl32(pb);
  72     tb_den = avio_rl32(pb);
  73     av_set_pts_info(vst, 32, tb_num, tb_den);
  74     vst->nb_frames = index_cnt;
  75     vst->duration  = index_cnt;
  76
  77     switch (avio_rl32(pb)) {
  78     case 0:
  79         audio_codec_id = CODEC_ID_MP3;
  80         break;
  81     case 1:
  82         av_log(s, AV_LOG_WARNING, "AAC is not yet correctly supported\n");
  83         audio_codec_id = CODEC_ID_AAC;
  84         break;
  85     default:
  86         av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");
  87         break;
  88     }
  89     pmp->num_streams = avio_rl16(pb) + 1;
  90     avio_skip(pb, 10);
  91     srate    = avio_rl32(pb);
  92     channels = avio_rl32(pb) + 1;
  93     for (i = 1; i < pmp->num_streams; i++) {
  94         AVStream *ast = avformat_new_stream(s, NULL);
  95         if (!ast)
  96             return AVERROR(ENOMEM);
  97         ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  98         ast->codec->codec_id    = audio_codec_id;
  99         ast->codec->channels    = channels;
 100         ast->codec->sample_rate = srate;
 101         av_set_pts_info(ast, 32, 1, srate);
 102     }
 103     pos = avio_tell(pb) + 4 * index_cnt;
 104     for (i = 0; i < index_cnt; i++) {
 105         int size  = avio_rl32(pb);
 106         int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
 107         size >>= 1;
 108         av_add_index_entry(vst, pos, i, size, 0, flags);
 109         pos += size;
 110     }
 111     return 0;
 112 }
 113
 114 static int pmp_packet(AVFormatContext *s, AVPacket *pkt)
 115 {
 116     PMPContext *pmp = s->priv_data;
 117     AVIOContext *pb = s->pb;
 118     int ret = 0;
 119     int i;
 120
 121     if (pb->eof_reached)
 122         return AVERROR_EOF;
 123     if (pmp->cur_stream == 0) {
 124         int num_packets;
 125         pmp->audio_packets = avio_r8(pb);
 126         num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
 127         avio_skip(pb, 8);
 128         pmp->current_packet = 0;
 129         av_fast_malloc(&pmp->packet_sizes,
 130                        &pmp->packet_sizes_alloc,
 131                        num_packets * sizeof(*pmp->packet_sizes));
 132         if (!pmp->packet_sizes_alloc) {
 133             av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
 134             return AVERROR(ENOMEM);
 135         }
 136         for (i = 0; i < num_packets; i++)
 137             pmp->packet_sizes[i] = avio_rl32(pb);
 138     }
 139     ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
 140     if (ret > 0) {
 141         ret = 0;
 142         // FIXME: this is a hack that should be removed once
 143         // compute_pkt_fields() can handle timestamps properly
 144         if (pmp->cur_stream == 0)
 145             pkt->dts = s->streams[0]->cur_dts++;
 146         pkt->stream_index = pmp->cur_stream;
 147     }
 148     pmp->current_packet++;
 149     if (pmp->current_packet == 1 || pmp->current_packet > pmp->audio_packets)
 150         pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
 151
 152     return ret;
 153 }
 154
 155 static int pmp_seek(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
 156 {
 157     PMPContext *pmp = s->priv_data;
 158     pmp->cur_stream = 0;
 159     // fallback to default seek now
 160     return -1;
 161 }
 162
 163 static int pmp_close(AVFormatContext *s)
 164 {
 165     PMPContext *pmp = s->priv_data;
 166     av_freep(&pmp->packet_sizes);
 167     return 0;
 168 }
 169
 170 AVInputFormat ff_pmp_demuxer = {
 171     .name           = "pmp",
 172     .long_name      = NULL_IF_CONFIG_SMALL("Playstation Portable PMP format"),
 173     .priv_data_size = sizeof(PMPContext),
 174     .read_probe     = pmp_probe,
 175     .read_header    = pmp_header,
 176     .read_packet    = pmp_packet,
 177     .read_seek      = pmp_seek,
 178     .read_close     = pmp_close,
 179 };